Only one cluster, max.

Only allow one cluster for bigtable instances. We can expand to 2 for
2.0.0.

Author: paddycarver

google/resource_bigtable_instance.go

@@ -41,7 +41,7 @@ func resourceBigtableInstance() *schema.Resource {
 			"cluster": {
 				Type:          schema.TypeSet,
 				Optional:      true,
-				MaxItems:      2,
+				MaxItems:      1,
 				ConflictsWith: []string{"cluster_id", "zone", "num_nodes", "storage_type"},
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{

website/docs/r/bigtable_instance.html.markdown

@@ -40,7 +40,7 @@ The following arguments are supported:
 
 * `display_name` - (Optional) The human-readable display name of the Bigtable instance. Defaults to the instance `name`.
 
-* `cluster` - (Optional) A block of cluster configuration options. Either `cluster` or `cluster_id` must be used. At most two clusters may be specified. See structure below.
+* `cluster` - (Optional) A block of cluster configuration options. Either `cluster` or `cluster_id` must be used. Only one cluster may be specified. See structure below.
 
 * `cluster_id` - (Optional, Deprecated) The ID of the Cloud Bigtable cluster. Use `cluster.cluster_id` instead.